Bream farming technology
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The breeding season of the blue snapper sunfish is from March to October in Guangdong, and the water temperature is above 20 °C. 1 The fish of the winter age can be propagated, belonging to the fish that repeatedly spawn.
The eggs of the blue pecker sunfish are very small, so the newly hatched seedling bait is mainly plankton. With the growth of the individual, the artificial diet can be supplemented when reaching 2.5 ,. The content of protein in the artificial diet must be more than 32%. Because the blue-bellied sunfish are tame and incompetent when they ingest food, they are less prosperous and have less food intake. Therefore, it is difficult to domesticate compound feeds in large-scale fish ponds. It should be cultivated to a body length of 2.5 in breeding ponds. When the above, it is transferred to other small cement ponds or earthen ponds for domesticated compound feeds. Blue ray sunfish is a pelagic fish. When domesticated, it does not feed on the feed that sinks to the bottom. Therefore, it is necessary to make a small amount of feed when formulating feeds. Because of its small diameter, the compound feed should be powdery or granular. At the time of domestication, the whole pool is splashed and then supplemented with zooplankton. As domestication progresses, the amount of formulated feed is gradually increased to gradually reduce the amount of zooplankton and finally domesticated into a feed compound feed. When the fry reaches 3-4, the fish pond can be grown.
In the first ten days before the fry, the fish should be used to disinfect the fish ponds. There are two advantages to using the tea dry pond. The first can completely kill the wild fish and shrimp; the second tea has a good fertilizer and water effect. From clear ponds to fishery ponds, pond water is rich in plankton, which plays an important role in the survival rate of fish fry ponds.
It is best to cultivate a single fish with a small amount of squid and squid, because the blue scorpion fish are small in size and have poor feeding ability, so they cannot generally be polycultured with other individuals who tend to eat faster fish. Each mu of ponds can be stocked with about 4 to 3000 fry.
After the fish fry under the pond, the daily feeding amount is 10% of the fish's body weight, and the feed is fed 4 times a day, and each time the feeding is performed, a larger area is to be sprinkled, and then it is determined whether or not gradually according to the feeding condition of the fry. The range, after a large area feeding of the fish ponds after a period of time, can be reduced to a range of feeding, in order to improve the utilization of feed. As the individual fry grows, the daily feed is gradually changed to 4% of the fish's body weight. At this time, the feed can be changed twice a day. When the water temperature dropped to 10 °C, according to the fish's feeding conditions to determine the amount of feed. When the pond water needs to be changed, the water inlet must be filtered with a net to prevent other larger wild fish from mixing into the pond and killing smaller individuals. Bluebirds have a good ability to resist disease, but if the water quality is in a state of deterioration for a long time, it will still affect its growth and reduce its resistance.
Bluegill sunfish have a slower growth rate, but they can be marketed when individuals reach 80-100 g/tail, and can reach 100-150 g/tail in a pond after 6 months of culture. In the breeding process, males grow faster than females and individuals are larger. Blue ray sunfish are very popular among consumers, but their disadvantages are slow growth, small individuals, and limited breeding development. So my field is researching and developing hybrid sunfish to solve its slow growth and individual problems. It has now achieved success. Its growth rate is more than 50% faster than that of the blue snapper. This year it will have a large number of seedlings to provide for breeding.